Shockingly enough, there is an absolutely gigantic amount of people on Twitter who don't know who someone or something is. Today it's Dick Clark.

"Yes, there are those who don't know about Clark," Jen Chung wrote on LAist.com. "But to be fair, some aren't American and Clark was an American pop culture figure. And the young aren't as familiar with him, because he's only really been on TV lately as the New Year's Rockin' Eve host—and in limited segments."

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Of course, it's not just death that exposes Twitter's generational divide—anniversaries of historical news events show it as well.

"Wait!" user Sue D. wrote. "Titanic really happened? I thought it was just a movie."

"Guys, the Titanic was real!" @BabyDoe22 wrote. "#mindblown."

"I think the reason why bigger events exposes the divide is because people just want to participate in the conversation," Chung told Yahoo News. "They want to have a say, even though they might not have anything to say."

"People not knowing about the Titanic probably says more about gaps in the education system than gaps between generations," Lamb said. "But Dick Clark's death does expose that the cultural touch-points we take for granted aren't familiar everywhere."